High availability requires the following hardware and system components:
Windows NT Enterprise Edition (with Service Packs 6 and 6a) and Microsoft Cluster Server installed on both nodes, residing on local disk storage with the same path on both nodes (for example, C:\WINNT and C:\WINNT\Cluster).
A Microsoft-certified cluster. See your Microsoft documentation for a description of what constitutes a certified cluster.
Adaptive Server software installed on both cluster nodes, with the Sybase release directory (%SYBASE%) residing on local disk storage on the nodes (rather than shared disk storage).
Sybase data devices on shared disk drives.
Both Adaptive Servers must have an independent shared disk (or set of shared disks) for their data device storage. This area of shared disk stores all the companion database device files. Each companion can use only its own area of shared disk for its data devices.
This section discusses how to prepare Adaptive Server for a high availability configuration.
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